to presume one is better than others, or to be more capable and ambitious than others, or to self-select oneself as the qualified one (see Molina)
Alonso de Molina:
izninoquixtia. (pret. oizninoquixti.) presumir desi teniendose por mejor, o por mas abil que otros o preferirse y anteponerse alos otros. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 49r. col. 1. Thanks to Joe Campbell for providing the transcription.